基于表面等离子体共振的水质分析系统稳定性研究

Stability Research of Water Quality Analysis System Based on Surface Plasmon Resonance

根据表面等离子体共振的原理,建立了可用于长期、实时、不间断检测的水质分析系统.为了提高系统的稳定性,对表面等离子体共振传感芯片进行了改进,利用LB法在传感芯片的金属膜表面镀制了聚苯乙烯(PS)层.利用改进前后的表面等离子体共振传感芯片分别对两种样品进行了稳定性实验研究.分析经过长时间检测前后所测得的实验数据,发现改进后的水质分析系统所测得的溶液表面等离子体共振共振角的变化为改进前系统的1/10,最小反射率改变为改进前的1/30.实验证明,经过改进的水质分析系统能更适用于长期不间断的检测分析.

Based on the principle of the surface plasmon resonance （SPR）, the water quality analysis system ,which can be used in extended, real-time and continuous examination, has been found. In order to enhance the SPR system＇s stability, the SPR sensor chip of this system has been improved in the special method that a polystyrene （PS） film has been plated on the metal film surface of SPR sensor chip used the LB technology. Using the improved and unimproved SPR sensor chip, the stability experiment of two kind of sample has been researched respectively. Analyzing the experiment data after long time examination, the result has been obtained that the resonance angle change detected by the improved SPR system is 1/10 and the minimum reflectivity change is 1/30 detected by the unimproved system. The experiment result proves the improved water quality analysis system is the better than the others, because it can be used in extended and continuous examination.